Part of what makes women mysterious is that they all seem to be wired a bit differently. What they like and what works often seems to be due to where their nerves are wired. Some women cum hard from deep penetration (sometimes in only one thrust), while others never ever come that way. What percent of women you've had sex with could orgasm from deep thrusting? Were they older than those who could not? Based on my experience, less than half could come this way and they tended to be older.